DE102018117703A1 - Electric drive for a vehicle with a multi-branched transmission oil cooling circuit - Google Patents

Abstract

In electric vehicles, electric motors are used to generate the drive torque. It is possible that the electric vehicles are designed as pure electric vehicles that only use one or more electric motors for driving, or that they are designed as hybrid vehicles that use an internal combustion engine and an electric motor as the driving motor in parallel a vehicle 2 proposed with an electric motor 4, the electric motor 4 having a stator 6, a rotor 5 and a rotor shaft 7, with a gear section 8, the rotor shaft 7 forming an input into the gear section 8, with at least one output shaft 11, wherein the output shaft 11 forms an output from the gear section 8 and, wherein the rotor shaft 7 and the output shaft 11 are each formed as a hollow shaft and the output shaft 11 is guided in the rotor shaft 7, so that there is at least in sections between the output shaft 11 and the rotor shaft 7 forms a rotor ring space 13 with one In the housing 16, the housing 16 having a motor housing section 17 and a transmission housing section 18, a cooling jacket region 19 for cooling the stator 6 being formed in the motor housing section 17 and an oil sump region 21 for a transmission oil being formed in the transmission housing section 18 with an oil pump 22 for conveying the transmission oil in a transmission oil cooling circuit, the transmission oil cooling circuit running from the oil sump area 21 into the output shaft 11, the output shaft 11 having at least one oil outlet, and the output shaft 11 having an output shaft rotor output 25 as a first oil output and a front output shaft transmission output 32 as one second oil output.

Description

The invention relates to an electric drive with the features of the preamble of claim 1.

In electric vehicles, electric motors are used to generate the drive torque. It is possible that the electric vehicles are designed as pure electric vehicles that use only one or more electric motors for driving, or that they are designed as hybrid vehicles that use an internal combustion engine and an electric motor as the drive motor in parallel.

In the case of electric motors, too, it is necessary to remove the waste heat that is generated during the conversion of electrical energy into kinetic energy in order to be able to operate the drive in a predetermined temperature range. Furthermore, it is necessary to lubricate a transmission which is connected downstream of the electric motor and also to dissipate heat which arises from friction and other loss processes in the transmission.

It is already known from internal combustion engines to lubricate and cool the transmission via oil cooling circuits. It is also known to additionally cool the cylinders of the internal combustion engines using cooling circuits with a cooling fluid.

The publication DE 10 2011 007 255 A1 , which probably forms the closest prior art, discloses a drive device with a rotor arrangement which is assigned to an electric motor and is designed for rotation about an axis of rotation, the rotor arrangement having at least one axially extending channel section which is used to carry out a fluid for cooling the rotor arrangement is trained. The fluid is designed in particular as a lubricant which can be introduced through inlet openings of the rotor arrangement and can be discharged through outlet openings of the rotor arrangement. The lubricant emerging from the outlet openings of the rotor arrangement can be used to lubricate components in the drive device.

It is an object of the present invention to propose an electric drive for a vehicle with a transmission oil cooling circuit, which enables effective cooling of the electric drive. This object is achieved by an electric drive with the features of claim 1. Preferred or advantageous embodiments of the invention result from the subclaims, the following description and the attached figures.

The invention relates to an electric drive which is suitable and / or designed for a vehicle. The vehicle can in particular be a passenger car, truck, bus, etc. The vehicle can be designed as a hybrid vehicle, but it is preferably designed as a pure electric vehicle, which receives the full drive torque via one or more electric motors. The electric drive is particularly preferably designed as an electric axle, which converts the drive torque generated by an electric motor and distributes it to two driven wheels of the vehicle. Optionally, the vehicle can also have two such electrical axles. As an alternative to this, the electric drive is designed as a wheel hub motor, which is assigned to exactly one driven wheel. It is also possible for the electrical drive to be implemented as an electrical drive module which forms a component in a drive train for a hybrid vehicle.

The electric drive has an electric motor, the electric motor having a stator, a rotor and a rotor shaft. In particular, the rotor is designed as an inner rotor. In particular, the electric motor is designed as a permanently excited synchronous motor. In particular, the electric motor forms the only drive motor of the electric drive.

Furthermore, the electric drive has a gear section, the rotor shaft forming an input into the gear section. The gear section is designed to convert the drive torque from the electric motor, in particular to translate or step it down, and / or to distribute it, in particular to distribute it over two output shafts. Optionally, the gear section has a shift range so that different gear ratios can be represented in the gear section. The shift range can have a clutch arrangement for switching the shift range into different translations. In a preferred embodiment of the invention, the electric drive is implemented as a one-way drive, that is to say with a single implementation.

The electric drive has at least one output shaft, preferably this has two output shafts, the two output shafts leading to the driven wheels and / or being arranged coaxially to one another. The at least one output shaft forms an output from the gear section in order to guide the converted drive torque to the driven wheel.

The rotor shaft and the output shaft are each formed at least in sections or completely as a hollow shaft, the Output shaft is guided in the rotor shaft and preferably protrudes on both sides of the rotor shaft. The space between the output shaft and the rotor shaft forms a rotor ring space at least in sections. A ring width of the rotor ring space is designed in an axial region of the stator ubd / or rotor with a first width and then merges into a second width in the direction of the gear section, the second width preferably being smaller than the first width. In this preferred embodiment there is a larger volume in the area of the rotor, so that the heat capacity is increased and the cooling capacity is thereby improved.

The electric drive has a housing, the housing having at least one motor housing section for receiving the electric motor and a transmission housing section for receiving transmission components and / or the transmission section. A cooling jacket area for cooling the stator is provided in the motor housing section. The cooling jacket area is arranged coaxially and / or concentrically with the electric motor. The cooling jacket area is preferably in direct and / or physical contact with the stator in order to cool the stator and thus the electric motor. The cooling jacket area is preferably designed as a cooling sleeve. A cooling fluid flows through the cooling jacket area, the cooling fluid preferably being based on water and / or alcohol. An oil sump area is arranged in the gear housing section, which serves to collect gear oil in the gear housing section. The oil sump area can be designed, for example, as a dry sump area or as a wet sump area. In particular, the oil sump area is arranged in such a way that this gear oil, which runs off the gear components, collects.

Furthermore, the electric drive has an oil pump for conveying the transmission oil. The gear oil is conveyed in a gear oil cooling circuit which runs at least from the oil sump area into the output shaft, that is, into a hollow shaft area of the output shaft. The oil pump is preferably arranged in the transmission housing section and pumps the transmission oil from the oil sump region along the cooling jacket region into the output shaft. The transition from the housing to the output shaft is preferably carried out by means of a rotating union. For an oil outlet, the output shaft has at least one oil outlet.

It is proposed that the output shaft have an output shaft rotor output as a first oil output. The output shaft rotor output fluidically connects the interior of the output shaft, which is designed as a hollow shaft, with the rotor ring space. In particular, the output shaft rotor output is designed as one or more through openings in the output shaft. The gear oil emerging from the output shaft rotor outlet enters the rotor ring space and cools the rotor via the rotor shaft.

Furthermore, the output shaft has a front output shaft transmission output as a second oil output. The front output shaft transmission output is preferably designed as one or more through openings in the output shaft and enables the transmission oil to exit in the region of a front transmission region. The gear oil emerging from the output shaft gear output is directed into the front gear area and cools and / or lubricates gear components in the front gear area.

It is a consideration of the invention that a simple, space-saving and fault-prone solution is found through a particularly static and / or constructively predetermined distribution of the transmission oil between the rotor ring space and the front transmission area and any other transmission areas in order to effectively cool the electrical drive and to lubricate. The solution particularly impresses with its simplicity, since the distribution of the gear oil to the rotor ring space or the gear area or the gear areas can be set simply and permanently statically and / or constructively by the size of the oil outlets.

In a preferred development of the invention, the transmission oil cooling circuit runs from the output shaft rotor outlet through the rotor ring space via a rotor-side rotor shaft passage and a bypass to the oil sump area. The rotor-side rotor shaft passage is designed as one or more passage openings in the rotor shaft. The transmission oil, which was heated during the passage through the rotor, is thus guided past the transmission components from the transmission section via the bypass, so that the heated transmission oil in a first branch of the transmission oil cooling circuit parallel to the transmission components and / or to the transmission section Oil sump area is guided.

After the rotor shaft rotates, the rotor-side rotor shaft passage is also rotated. It is therefore preferred that the electric drive has a rotor-side gear ring space, the rotor-side gear ring space fluidly connecting the rotor-side rotor shaft passage to the bypass, regardless of the angular position of the rotor shaft.

In a preferred development of the invention, the transmission oil cooling circuit runs from the front output shaft transmission output via a front rotor shaft passage via a front transmission region of the transmission section to the oil sump region. The gear oil is thus initially guided axially in the output shaft, exits through the front output shaft gear output, crosses the rotor shaft through the front rotor shaft passage, and is thus guided into the front gear area of the gear section. Gear components are arranged in the front gear area, which are lubricated and / or cooled by the gear oil which emerges through the front rotor shaft passage. The transmission oil draining from the transmission components in the front transmission area is collected in the oil sump area. The gear oil in the gear oil cooling circuit is thus led to the oil sump area via a second branch, which is partially parallel to the first branch.

In a preferred embodiment of the invention, the electric drive has a front transmission annulus, the front transmission annulus fluidically connecting the front rotor shaft passage to the front transmission region.

In a preferred constructive embodiment of the invention, the electric drive has an oil guide ring, the oil guide ring being placed on the rotor shaft. The oil guide ring separates the rotor-side gear ring space from the front gear ring space. For example, the oil guide ring is designed as a plastic component or as a sheet metal component.

In a preferred implementation of the invention, the rotor-side rotor shaft passage has two exit openings which, in particular their center points, lie in a common first longitudinal sectional plane in which a main axis of the electric drive also lies. It is further preferably provided that the front rotor shaft passage likewise has two exit openings, the exit openings, in particular their center points, lying in a common second longitudinal section plane. The first and the second longitudinal section plane are arranged perpendicular to each other. As an alternative or in addition, it is provided that the outlet openings of the front rotor shaft passage are rotated by 90 ° with respect to the outlet openings of the rotor-side rotor shaft passage. In this way, a weakening of the output shaft is avoided and an imbalance of the output shaft is also reduced. In particular, the fluidic distribution in the rotor shaft is improved, so that the lubrication and / or cooling of the electric drive is improved.

In a preferred development of the invention, the output shaft has a rear output shaft transmission output as a third oil output, the transmission oil cooling circuit leading from the rear output shaft transmission output via a rear transmission region to the oil sump region. The transmission oil heated by the rear transmission region is thus guided into the oil sump region in a third branch parallel to the first and / or to the second branch.

In a preferred embodiment of the invention, the front gear region has a first planet carrier and an intermediate sun gear as gear components, the intermediate sun gear being arranged on the first planet carrier in a rotationally fixed manner. The intermediate sun gear forms an entrance to the rear gear area, in particular to the gear components of the rear gear area. The intermediate sun gear forms a rear gear ring space, the rear gear ring space being arranged between the rear output shaft gear output and the rear gear area in terms of flow. The rear gear ring space is fluidically separated from the front gear area by the intermediate sun gear and / or the first planet carrier. The electric drive thus has the front gear ring space, the rotor-side gear ring space and the rear gear ring space for distributing the gear oil into the three parallel branches of the gear oil cooling circuit.

In a preferred constructive implementation, the front gear area is designed as a transmission stage and the rear gear area is designed as a differential stage. In particular, the translation stage is implemented as a planetary stage. The differential stage is particularly preferably implemented as a planetary differential stage. In other configurations of the invention, the electric drive can also be switchable, so that a switching stage is optionally arranged with a clutch or double clutch between the electric motor and the differential stage.

• 1 eine schematische Längsschnittdarstellung eines elektrischen Antriebs als ein Ausführungsbeispiel der Erfindung;
• 2 eine schematische dreidimensionale Darstellung eines Details in der 1.

Further features, advantages and effects of the invention result from the following description of a preferred exemplary embodiment and the attached figures. These show:

• 1 is a schematic longitudinal sectional view of an electric drive as an embodiment of the invention;
• 2 is a schematic three-dimensional representation of a detail in the 1 ,

The 1 shows in a schematic longitudinal section along a major axis H an electric drive 1 as an embodiment of the invention. The electric drive 1 is as an electrical axis for a vehicle 2 trained, the vehicle 2 is only shown schematically as a block. The electric drive 1 is used to drive driven wheels 3 a, b of the vehicle 2 , For example, the electric drive 1 a driven rear axle of the vehicle 2 ,

The electric axis 1 has an electric motor 4 on. The electric motor 4 is by a rotor 5 and a stator 6 educated. The electric motor 4 is coaxial to the main axis H arranged. The rotor 5 is designed as an inner rotor and rotates around the main axis H , The rotor 5 is non-rotatable on a rotor shaft 7 put on, the rotor shaft 7 is designed as a hollow shaft.

The electric drive 1 has a gear section 8th on, the gear section 8th includes a plurality of transmission components. The gear section 8th can be in a front gear area 9 and in a rear gear area 10 be divided, with the front gear area 9 a gear ratio and the rear gear area 10 forms a differential stage. The rotor shaft 7 forms an entrance to the gear section 8th , especially in the front gear area 9 , The gear section 8th is coaxial to the main axis H arranged and / or aligned.

The electric drive 1 has an output shaft 11 and another output shaft 12 on. The output shafts 11 . 12 are arranged coaxially to one another and carry a drive torque from the electric drive 1 to the driven wheels 3 a, b. The output shaft 11 is designed as a hollow shaft and is in the rotor shaft 7 arranged coaxially and / or concentrically. It stands over the rotor shaft 7 over on both axial sides. Between the output shaft 11 and the rotor shaft 7 is a rotor ring room 13 formed, which is based on a first rotor bearing 14 in an axial area in which the rotor 5 is arranged opens. In the axial area of the rotor 5 is the rotor ring space 13 formed in the shape of a hollow cylinder. Starting from the axial area of the rotor 5 the rotor ring space narrows 13 towards a second rotor bearing 15 , The rotor ring room 13 extends over the second rotor bearing 15 out and leads to an axially open end exit. The output shaft 11 is in the area between the first of the second rotor bearings 14 . 15 formed as a straight hollow cylinder, the varying ring width of the rotor annulus 13 is determined by a varying free inner diameter of the rotor shaft 7 educated. The output shaft 11 forms an output from the gear section 8th , especially from the rear gear area 10 ,

The electric drive 1 has a housing 16 on being the housing 16 a motor housing section 17 and a gear housing section 18 having. In the motor housing section 17 is the electric motor 4 arranged. The engine case section 17 has a cooling jacket area 19 on which a plurality of channels 20 has, through which a cooling fluid can be carried out. The cooling fluid is water-based. The cooling jacket area 19 is designed in particular as a cooling sleeve. The stator 6 is in direct physical contact with the cooling jacket area 19 , in particular the cooling sleeve, so that a good thermal transfer between the stator 6 and cooling jacket area 19 can be done. In the gearbox section 18 is the gear section 8th , especially the front and rear gear area 9 . 10 arranged. The gearbox section 18 forms a gear chamber, an oil sump region in a bottom region of the gear chamber 21 is trained.

In a bottom area of the gear housing section 18 is an oil pump 22 arranged, which pumps the transmission oil in a transmission oil cooling circuit. The transmission oil cooling circuit is in the 1 visualized by arrows.

Starting from the oil sump area 21 pumps the oil pump 22 the gear oil through the cooling jacket area 19 namely in channels, which of the channels 20 the fluid cooling are separated so that the transmission oil cannot mix with the cooling fluid. By transporting the gear oil through the cooling jacket area 19 it is cooled. The cooled gear oil is fed through a radial channel 23 , which is in a cover of the housing 16 is introduced via a rotating union 24 into the interior of the output shaft designed as a hollow shaft 11 promoted.

Inside the output shaft 11 the transmission oil is continued in the axial direction. The output shaft 11 has an output shaft rotor output 25 on, which is designed as two through openings that the output shaft 11 , especially the wall of the output shaft 11 break through in the radial direction. The two through openings lie in a common, first longitudinal sectional plane, as in FIG 1 is shown. Starting from the output shaft rotor output 25 the gear oil takes a first branch in the gear oil cooling circuit, with the output shaft rotor output 25 in the axial direction in front of or at the first end of the rotor 5 located. Starting from the output shaft rotor output 25 the gear oil crosses the rotor ring space 13 and cools indirectly via the rotor shaft 7 the rotor 5 and thus the electric motor 4 , That about the electric motor 4 heated gear oil is in the axial direction after the rotor 5 continued in a tapered area until it reaches a rotor-side rotor shaft passage 26 arrives. The rotor-side rotor shaft passage 26 is as two through holes in the rotor shaft 7 educated. After passing through the rotor side rotor shaft passage 26 the heated gear oil reaches a gear ring space on the rotor side 27 which is coaxial with the main axis H is arranged. The rotor-side gear annulus 27 is on one axial side through the second rotor bearing 15 and on the other side through an oil guide ring 28 and in the radial direction through a housing section of the housing 16 limited.

The oil guide ring 28 is in the 2 shown more clearly and has a hollow cylindrical contact section 29 on which on the rotor shaft 7 rotatably and which in the area of the rotor-side rotor shaft passage 26 also has through openings or windows, so that the heated transmission oil the oil guide ring 28 can cross. Furthermore, the oil guide ring 28 a collar section 30 on which is in a radial plane to the main axis H extends and the rotor-side gear annulus 27 limited in the axial direction. The oil guide ring 28 is designed in particular as a baffle, for example made of metal or plastic.

Starting from the rotor annulus on the rotor side 27 the heated gear oil is bypassed 31 passed so that this on the gear section 8th is passed without the gear components of the gear section 8th to happen. The bypass 31 is as a channel in a housing portion of the housing 16 formed and extends in the radial direction to the main axis H and is towards the oil sump area 21 directed so that the heated gear oil in the oil sump area 21 to be led.

Another part of the gear oil is routed along a second branch. This part of the gear oil traverses in the output shaft 11 the area of the rotor 5 and occurs - considering the axial position and flow direction - only behind the rotor-side rotor shaft passage 26 via a front output shaft transmission output 32 from the output shaft 11 in the radial direction.

The front output shaft transmission output 32 is formed by two through openings, which in the first longitudinal sectional plane of the output shaft rotor output 25 lie.

The rotor shaft 7 has a front rotor shaft passage 33 on which only in the 2 can be seen because the front rotor shaft passage 33 is formed by 2 through openings, which lie in a second longitudinal section plane, which is perpendicular to the first longitudinal section plane. In other words, the two through holes are the front rotor shaft passage 33 by 90 ° in relation to the through openings of the rotor-side rotor shaft passage 26 twisted.

After passing through the rotor shaft 7 the still cool gear oil gets into a front gear annulus 34 , which on the one hand through the oil guide ring 28 is limited in the axial direction and in the radial direction by the housing section of the housing 16 is covered, with a circumferential gap remaining, so that the cool gear oil in the front gear area 9 can lubricate the gear components.

The front gear area 9 is formed by a translation stage, which is designed as a planetary gear. The translation stage has a first sun gear 35 on which rotatably on the rotor shaft 11 is put on. This forms the rotor shaft 11 an input in the gear ratio and / or in the front transmission area 9 , Furthermore, the translation stage has a first planet carrier 36 as well as a first set of planets 37 on which on the planet carrier 36 are rotatably attached and which with the first sun gear 35 comb. With the first planet carrier 36 is an intermediate sun gear 38 rotatably connected, which has an output from the gear ratio and / or the front gear area 9 and an entrance to the rear gear area 10 forms. The components of the transmission stage and / or the front transmission area are cooled and lubricated by the cooled transmission oil, which is passed over the second branch. The cooled transmission oil of the second branch is after cooling and / or lubrication of the transmission stage and / or the front transmission area 9 thrown off or drips off and gets into the oil sump area 21 ,

Another part of the gear oil, which was initially still cooled, is led along a third branch. It happens in the axial direction in the output shaft 11 the front output shaft transmission output 32 and meets a rear output shaft transmission output behind 39 , which acts as two through holes in the output shaft 11 is formed, the wall of the output shaft 11 pierce in the radial direction. The initially cooled gear oil leaves via the rear output shaft gear output 39 the output shaft 11 and is in the rear gear area 10 distributed to the gear components for lubrication and / or cooling.

The rear gear area 10 is formed by a differential stage, which is designed as a planetary differential stage. This has a second planet carrier 40 as well as a sentence planet waves 41 on which on the second planet carrier 40 are rotatably arranged. Furthermore, the differential stage and / or the rear transmission area 10 two exit sun gears 42 a, b on, the output sun gear 42 a on the output shaft 11 is rotatably attached and another output sun gear 42 b on the further output shaft 12 is rotatably attached. A first section of the planetary waves 41 combs with the intermediate sun gear 38 , A second planetary section of the planetary waves 41 combs a ring gear, not shown. On the second planet carrier 40 there are two sets of planet gears arranged in pairs with each other and also with the output sun gears 42 comb a, b. The components of the differential stage and / or the rear transmission area 10 are cooled and lubricated by the cooled gear oil, which is passed through the third branch. The cooled gear oil of the third branch is after cooling and / or lubrication of the differential stage and / or the rear gear area 10 thrown off or drips off and gets into the oil sump area 21 ,

Through the sun gear 38 and / or the first planet carrier 36 becomes a rear gear annulus 43 formed, which is in the axial direction to the rear transmission area 10 and / or is open to the differential stage.

The performance and efficiency of the electric motor 4 as an electric machine in the electric drive 1 depends to a large extent on thermal boundary conditions. Waste heat generated must be removed as best as possible. As a rule, the waste heat generated is dissipated using cooling concepts that are based on the stator 6 and dissipate any heat generated at the end windings. However, some of the heat also flows into the rotor laminations of the rotor 5 and rotor shaft 7 , In the case of internally running, permanently excited synchronous motors, there is a risk of permanent demagnetization of the permanent magnets and thus an impairment / malfunction of the function of the electric machine. A heat dissipation in the rotor system (rotor laminated core + rotor shaft 7 ) is therefore of great importance - depending on the requirements for the electric machine / the concept. The targeted oiling of defined areas in the gear section is also related to the overall system 8th necessary. In addition to the lubrication of tooth contacts and roller bearings, the cooling of these gear components should not be neglected.

Previous concepts see, among other things, a supply of the coolant (water / glycol mixture or uncooled gear oil) into the rotor shaft 7 by means of a tubular profile with a channel or with elaborate rotary unions. In addition to cooling the active parts of the electric machine (stator 6 and rotor 5 ) it is also useful components in the gearbox section 8th which forces transmit or support to cool. The components, such as the needle roller and cage assemblies for planetary storage, can only achieve the necessary service life if they are sufficiently cooled. Starting from a coaxial gear arrangement with feedback of the output shaft 11 from the differential stage through the rotor shaft 7 to the wheel there is a possibility that in the output shaft 11 to divide the oil introduced to cool the electric machine and thus the gear section 8th to provide cold oil. The oil is extracted from the gear sump 21 removed and cooled. The cooled oil is then passed through the rotating union 24 into the output shaft 11 promoted. The output shaft 11 is drilled hollow or as a pipe. Shortly after the introduction into the output shaft 11 can use some of the oil to cool the rotor shaft 7 escape. The remaining oil is through the output shaft 11 to the gear section 8th forwarded. The cold oil can be cleverly distributed here and used to efficiently cool gear components.

LIST OF REFERENCE NUMBERS

1

electric drive

2

vehicle

3a, b

driven wheels

4

electric motor

5

rotor

6

stator

7

rotor shaft

8th

gear section

9

front gear area

10

rear gear area

11

output shaft

12

further output shaft

13

Rotor annulus

14

first rotor bearing

15

second rotor bearing

16

casing

17

Motor housing portion

18

Transmission case portion

19

Cooling jacket area

20

channels

21

Oil sump area

22

oil pump

23

radial channel

24

Rotary union

25

Output shaft rotor output

26

rotor-side rotor shaft passage

27

rotor-side gear annulus

28

oil guide ring

29

hollow cylindrical contact section

30

collar section

31

bypass

32

front output shaft transmission output

33

front rotor shaft passage

34

front gear annulus

35

first sun gear

36

first planet carrier

37

first set of planets

38

Zwischensonnenrad

39

rear output shaft transmission output

40

second planet carrier

41

Set of triple planetary waves

42a, b

Output sun gears

43

rear gear annulus

H

main axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102011007255 A1 [0005]

Claims (10)

Electric drive (1) for a vehicle (2) with an electric motor (4), the electric motor (4) having a stator (6), a rotor (5) and a rotor shaft (7), with a gear section (8), wherein the rotor shaft (7) forms an input into the gear section (8) with at least one output shaft (11), the output shaft (11) forms an output from the gear section (8) and, wherein the rotor shaft (7) and the output shaft (11) are each designed as a hollow shaft and the output shaft (11) is guided in the rotor shaft (7), so that a rotor ring space (13) is formed at least in sections between the output shaft (11) and the rotor shaft (7), with a Housing (16), the housing (16) having a motor housing section (17) and a transmission housing section (18), a cooling jacket region (19) for cooling the stator (6) being formed in the motor housing section (17) and wherein in the transmission housing section (18) an oil sump region (21) is designed for a transmission oil, with an oil pump (22) for conveying the transmission oil in a transmission oil cooling circuit, characterized in that the transmission oil cooling circuit runs from the oil sump region (21) into the output shaft (11), the output shaft (11) has at least one oil output, and that the output shaft (11) has an output shaft rotor output (25) as a first oil output and a front output shaft gear output (32) as a second oil output. Electric drive (1) after Claim 1 , characterized in that the transmission oil cooling circuit leads from the output shaft rotor outlet (25) through the rotor ring space (13) via a rotor-side rotor shaft passage (26) and a bypass (31) to the oil sump area (21). Electric drive (1) after Claim 2 , characterized in that the rotor-side rotor shaft passage (26) is connected to the bypass (31) in terms of flow technology via a rotor-side gear ring space (27). Electric drive (1) according to one of the preceding claims, characterized in that the transmission oil cooling circuit leads from the front output shaft transmission output (32) via a front rotor shaft passage (33) via a front transmission region (9) of the transmission section (8) to the oil sump region (21) , Electric drive (1) after Claim 4 , characterized in that the front rotor shaft passage (33) is connected in terms of flow technology to the front transmission area (9) via a front transmission annulus (34). Electric drive (1) after Claim 5 characterized in that the electric drive (1) has an oil guide ring (28), the oil guide ring (28) being placed on the rotor shaft (7) and the oil guide ring (28) the rotor-side gear ring space (27) and the front gear ring space ( 34) separates. Electric drive (1) according to one of the preceding claims, characterized in that the rotor-side rotor shaft passage (26) has two outlet openings, the outlet openings lying in a common first longitudinal section plane and in that the front rotor shaft passage (33) has two outlet openings, the outlet openings in a common second longitudinal section plane, wherein the first and second longitudinal section planes are arranged perpendicular to each other. Electric drive (1) according to one of the preceding claims, characterized in that the output shaft (11) has a rear output shaft transmission output (39) as a third oil output, the transmission oil cooling circuit from the rear output shaft transmission output (39) via a rear transmission area (10) of the Gear section (8) leads to the oil sump area (21). Electric drive (1) according to one of the preceding claims, characterized in that the front gear region (9) has a first planet carrier (36) and an intermediate sun gear (38), the intermediate sun gear (38) being arranged on the first planet carrier (36) in a rotationally fixed manner and wherein the intermediate sun gear (38) forms an entrance to the rear transmission area (10), wherein the intermediate sun gear (38) forms a rear transmission annulus (43), the rear transmission annulus (43) being fluidly connected between the rear output shaft transmission outlet (39) and the Rear gear area (10) is arranged and the rear gear ring space (43) is separated from the front gear area (9) in terms of flow by the intermediate sun gear (38) and / or the first planet carrier (36). Electric drive (1) after Claim 8 or 9 , characterized in that the front gear area (9) is designed as a transmission stage and the rear gear area (10) as a differential stage.

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